Hyaluronic acid pen



FIG. 1 is a perspective view of a hyaluronic acid pen showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines in the drawings illustrate the environment of the hyaluronic acid pen which forms no part of the claimed design. 

CLAIM I claim, the ornamental design for a hyaluronic acid pen, as shown and described. 